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Journal articles on the topic 'Magnetic transition'

Author: Grafiati

Published: 4 June 2021

Last updated: 9 February 2022

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1

Rahman, Md Arifur. "Analysis of the Formation of Magnetic Transition in Digital Magnetic Recording System." International Journal of Engineering Research 3, no. 2 (February 1, 2014): 83–87. http://dx.doi.org/10.17950/ijer/v3s2/210.

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2

Aguilera-Granja, F., and J. L. Morán-López. "Magnetic non-magnetic transitions in non-magnetic transition metal clusters." Nanostructured Materials 9, no. 1-8 (January 1997): 685–88. http://dx.doi.org/10.1016/s0965-9773(97)00151-7.

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3

Gunsser, W., D. Fruehauf, A. Zimmermann, A. Wiedenmann, and E. Gmelin. "Magnetic phase transitions of transition metal cyclo-tetraphosphates." Journal of Magnetism and Magnetic Materials 90-91 (December 1990): 199–202. http://dx.doi.org/10.1016/s0304-8853(10)80070-8.

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4

Zhao, J., X. Chen, Q. Sun, F. Liu, and G. Wang. "Critical Size for Magnetic–Non-magnetic Transition in Transition Metal Clusters." Europhysics Letters (EPL) 32, no. 2 (October 10, 1995): 113–17. http://dx.doi.org/10.1209/0295-5075/32/2/004.

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5

Tanaka, Katsushi, Shinji Nagano, Norihiko L. Okamoto, and Haruyuki Inui. "OS02-4-1 Elastic softening in CrB_2 at the magnetic transition temperature." Abstracts of ATEM : International Conference on Advanced Technology in Experimental Mechanics : Asian Conference on Experimental Mechanics 2011.10 (2011): _OS02–4–1—. http://dx.doi.org/10.1299/jsmeatem.2011.10._os02-4-1-.

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6

Yuldashev, Shavkat, Vadim Yalishev, Ziyodbek Yunusov, Younghae Kwon, and Tae Won Kang. "Magnetic phase transitions in ZnO doped by transition metals." physica status solidi (c) 13, no. 7-9 (February 9, 2016): 559–63. http://dx.doi.org/10.1002/pssc.201510221.

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7

ACHARYYA, MUKTISH. "NONEQUILIBRIUM PHASE TRANSITIONS IN MODEL FERROMAGNETS: A REVIEW." International Journal of Modern Physics C 16, no. 11 (November 2005): 1631–70. http://dx.doi.org/10.1142/s0129183105008266.

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The thermodynamical behaviors of ferromagnetic systems in equilibrium are well studied. However, the ferromagnetic systems far from equilibrium became an interesting field of research in last few decades. Recent exploration of ferromagnetic systems in the presence of a steady magnetic field are also studied by using standard tools of equilibrium statistical physics. The ferromagnet in the presence of time-dependent magnetic field, shows various interesting phenomena. An usual response of a ferromagnet in the presence of a sinusoidally oscillating magnetic field is the hysteresis. Apart from this hysteretic response, the nonequilibrium dynamic phase transition is also a very interesting phenomenon. In this chapter, the nonequilibrium dynamic phase transitions of the model ferromagnetic systems in presence of time-dependent magnetic field are discussed. For this kind of nonequilibrium phase transition, one cannot employ the standard techniques of equilibrium statistical mechanics. The recent developments in this direction are mainly based on numerical simulation (Monte Carlo). The Monte Carlo simulation of kinetic Ising model, in presence of sinusoidally oscillating (in time but uniform over space) magnetic field, is extensively performed to study the nonequilibrium dynamic phase transition. The temperature variations of dynamic order parameter, dynamic specific heat, dynamic relaxation time etc. near the transition point are discussed. The appearance and behaviors of a dynamic length scale and a dynamic time scale near the transition point are also discussed. All these studies indicate that this proposed dynamic transition is a nonequilibrium thermodynamic phase transition. The disorder (quenched) induced zero temperature (athermal) dynamic transition is studied in random field Ising ferromagnet. The dynamic transition in the Heisenberg ferromagnet is also studied. The nature of this transition in the Heisenberg ferromagnet depends on the anisotropy and the polarisation of the applied time varying magnetic field. The anisotropic Heisenberg ferromagnet in the presence of elliptically polarised magnetic field shows multiple dynamic transitions. This multiple dynamic transitions in anisotropic Heisenberg ferromagnet are discussed here. Recent experimental evidences of dynamic transitions are also discussed very briefly.

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8

Walden, C. J., and B. L. Györffy. "A MAGNETIC WETTING TRANSITION." Le Journal de Physique Colloques 49, no. C8 (December 1988): C8–1635—C8–1636. http://dx.doi.org/10.1051/jphyscol:19888747.

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9

Kolenda, M., J. Leciejewicz, A. Szytula, N. Stüsser, and Z. Tomkowicz. "Magnetic transition in TbMn2Si2." Journal of Alloys and Compounds 241, no. 1-2 (August 1996): L1—L3. http://dx.doi.org/10.1016/0925-8388(96)02333-x.

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10

Andriushchenko, Petr Dmitrievich, and Konstantin Valentinovich Nefedev. "Magnetic Phase Transitions in the Lattice Ising Model." Advanced Materials Research 718-720 (July 2013): 166–71. http://dx.doi.org/10.4028/www.scientific.net/amr.718-720.166.

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In this paper we consider an approach, which allows the research of order-disorder transitionin lattice systems (with any distribution of the exchange integrals) in the frame of Ising model. Anew order parameters, which can give a description of a phase transitions, are found. The commondefinition of such order parameter is the mean value of percolation cluster size. Percolation clusterincludes spins in ground state. The transition from absolute disorder to correlated phase could bestudied with using of percolation theory methods.

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11

Kazama, Takuto, Minoru Maeda, Kouichi Takase, Yoshiki Takano, and Tadataka Watanabe. "Electric and Magnetic Properties of Transition-Metal Carbide Sc₃TC₄ (T=Co, Ru, Os)." Solid State Phenomena 257 (October 2016): 34–37. http://dx.doi.org/10.4028/www.scientific.net/ssp.257.34.

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We investigate electric and magnetic properties of quasi-one-dimensional transition-metal carbides Sc3TC4 (T = Co, Ru, and Os), and their mixed crystals Sc3(Co1-xRux)C4 and Sc3(Ru1-xOsx)C4. Sc3CoC4 exhibits successive phase transitions of charge-density-wave transition at TCDW ~ 140 K, Peierls-like structural transition at Ts ~ 70 K, and superconducting transition at Tc ~ 5 K. Sc3RuC4 and Sc3OsC4 exhibit a phase transition at T* ~ 220 K and 250 K, respectively, which should occur in the low-dimensional electronic structure. For Sc3CoC4, it is revealed by the investigation of the electric and magnetic properties of Sc3(Co1-xRux)C4 that the phase transitions at TCDW, Ts, and Tc exhibit different robustness against Ru doping. For Sc3RuC4 and Sc3OsC4, it is revealed by the investigation of the electric and magnetic properties of Sc3(Ru1-xOsx)C4 that an identical kind of phase transition occurs at T*. Additionally, the present study reveals that the phase transition at T* in Sc3RuC4 and Sc3OsC4 is inherently different from the phase transitions at TCDW, Ts, and Tc in Sc3CoC4.

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12

KANOMATA, T., and T. KANEKO. "MAGNETIC PROPERTIES OF Mn3−xCoxGaC (x≤0.5)." International Journal of Modern Physics B 07, no. 01n03 (January 1993): 871–74. http://dx.doi.org/10.1142/s0217979293001864.

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The magnetic properties of Mn3–xCoxGaC(x≤0.5) are studied in order to investigate the nature of the magnetic order-order phase transitions. The magnetic phase diagram for the transition temperatures versus concentration is determined. On the basis of these results, the relation between the effect of alloying and of pressure on the magnetic transitions of Mn3−xCoxGaC system is discussed.

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13

ACHARYYA, MUKTISH. "NONEQUILIBRIUM MULTICRITICAL BEHAVIOR IN ANISOTROPIC HEISENBERG FERROMAGNET DRIVEN BY OSCILLATING MAGNETIC FIELD." International Journal of Modern Physics C 17, no. 08 (August 2006): 1107–30. http://dx.doi.org/10.1142/s0129183106009060.

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The Heisenberg ferromagnet (uniaxially anisotropic along z-direction), in the presence of time dependent (but uniform over space) magnetic field, is studied by Monte Carlo simulation. The time dependent magnetic field was taken as elliptically polarised in such a way that the resulting field vector rotates in the XZ-plane. In the limit of low anisotropy, the dynamical responses of the system are studied as functions of temperature and the amplitudes of the magnetic field. As the temperature decreases, it was found that the system undergoes multiple dynamical phase transitions. In this limit, the multiple transitions were studied in details and the phase diagram for this observed multicritical behavior was drawn in field amplitude and temperature plane. The natures (continuous/discontinuous) of the transitions are determined by the temperature variations of fourth-order Binder cumulant ratio and the distributions of order parameters near the transition points. The transitions are supported by finite size study. The temperature variations of the variances of dynamic order parameter components (for different system sizes) indicate the existence of diverging length scale near the dynamic transition points. The frequency dependences of the transition temperatures of the multiple dynamic transition are also studied briefly.

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14

Вальков, В. И., В. И. Каменев, А. В. Головчан, И. Ф. Грибанов, В. В. Коледов, В. Г. Шавров, В. И. Митюк, and П. Дуда. "Магнитные и магнитокалорические эффекты в системах с реверсивными переходами первого рода." Физика твердого тела 63, no. 5 (2021): 628. http://dx.doi.org/10.21883/ftt.2021.05.50813.271.

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Within the framework of the model of interacting parameters of magnetic and structural orders, a theoretical analysis of magnetostructural reversible first-order phase transitions is carried out. Reversible phase transitions are characterized by a jump-like appearance of magnetic order with decreasing temperature (as in a first-order phase transition), and with a reverse increase in temperature, the magnetic order gradually disappears (as in a second-order phase transition). Such transitions are observed in some alloys of the Mn_{1-x}Cr_{x}NiGe magnetocaloric system under pressure (x = 0.11) and without (x = 0.18) and are accompanied by specific magnetic and magnetocaloric features. A phenomenological description of these features is carried out within the concept of a soft mode for the structural subsystem undergoing first-order structural phase transition (P6_{3}/mmc-P_{nma}) and the Heisenberg model for the spin subsystem. For systems with magnetostructural instability within the molecular field approximation for the spin subsystem and the shifted harmonic oscillator approximation for the lattice subsystem, it is shown that the reversible phase transitions arise when the temperature of magnetic disordering is in the temperature hysteresis region of the 1st order structural phase transition P6_{3}/mmc-P_{nma}. It is also shown that the two-peak form of the isothermal entropy, which is characteristic of reversible transitions, is due to the separation of the structural and magnetic entropy contributions.

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15

Guirado-López, R., D. Spanjaard, and M. C. Desjonquères. "Magnetic-nonmagnetic transition in fcc4d-transition-metal clusters." Physical Review B 57, no. 11 (March 15, 1998): 6305–8. http://dx.doi.org/10.1103/physrevb.57.6305.

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16

Paar, Nils, Goran Kružić, and Tomohiro Oishi. "Nuclear magnetic transitions in the relativistic energy density functional approach." EPJ Web of Conferences 252 (2021): 02002. http://dx.doi.org/10.1051/epjconf/202125202002.

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Recently a novel theory framework has been established for description of magnetic dipole (M1) transitions in finite nuclei, based on relativistic nuclear energy density functional with point coupling interactions. The properties of M1 transitions have been studied, including the sum rules, spin, orbital, isoscalar and isovector M1 transition strengths in magic and open shell nuclei. It is shown that pairing correlations and spinorbit interaction plays an important role in the description of M1 transition strength distributions. The analysis of the evolution of M1 transition properties in the isotope chain 100-140 Sn shows the interplay between single and double-peak structures, determined by the evolution of single-particle states, their occupations governed by the pairing correlations, and two-quasiparticle transitions involved. Comparison of the calculated B(M1) transition strength with recent data from inelastic proton scattering on 112-124 Sn, shows that quenching of the g factors geff/gfree =0.80-0.93 is required to reproduce the experimental data. Further experimental investigations are needed to determine accurately the quenching factor.

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17

Oomi, G., N. Matsuda, T. Kagayama, C. K. Cho, and P. C. Canfield. "Electronic Properties of Magnetic Superconductor HoNi2B2C Under High Pressure." International Journal of Modern Physics B 17, no. 18n20 (August 10, 2003): 3664–71. http://dx.doi.org/10.1142/s0217979203021587.

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The electrical resistivity of single crystalline HoNi 2 B 2 C has been measured at high pressure and magnetic fields. The three anomalies in the magnetoresistance due to metamagnetic transitions are observed both at ambient and high pressures. It is found that the metamagnetic transition fields increase with increasing pressure. The temperature dependence of electrical resistivity is strongly dependent on magnetic field. Non Fermi liquid behavior is observed near the metamagnetic transition fields. But the normal Fermi liquid behavior recovers after completing the phase transition. The Grüneisen parameters are also calculated to examine the stability of electronic state.

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18

Sugano, Tadashi, Mohamedally Kurmoo, Stephen J. Blundell, William Hayes, and Serge Vilminot. "Magnetic phase transitions in transition–metal complexes with triazole derivatives." Polyhedron 30, no. 18 (November 2011): 3202–5. http://dx.doi.org/10.1016/j.poly.2011.04.011.

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19

Ishibashi, Hiroki, Hiroki Iwane, Shogo Kawaguchi, and Yoshiki Kubota. "Structural and magnetic properties of spinel compound Fe1+xCoxV2O4." Acta Crystallographica Section A Foundations and Advances 70, a1 (August 5, 2014): C1357. http://dx.doi.org/10.1107/s2053273314086422.

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Vanadium spinel oxides AV2O4have attracted much attention for recent years because they show the peculiar physical properties which are caused by competition and cooperation of spin, orbital and lattice degrees of freedom. Among such compounds, FeV2O4is a unique compound showing successive phase transitions: cubic to tetragonal (c < a) at ~140 K, from tetragonal to orthorhombic accompanied by ferrimagnetic transition at ~110 K and from orthorhombic to tetragonal (c > a) at ~70 K with decreasing temperature. It is suggested that these phase transitions originate from the orbital degrees of freedom of both Fe2+ions at A-site (tetrahedral site) and V3+ones at B-site (octahedral site), however, the origin remains controversial. In the present study, we investigate the substitution effect of Fe2+with Co2+having no orbital degrees of freedom to clarify the role of the orbital degree of Fe2+at the A-site. We carried out magnetization and specific heat measurements and synchrotron powder diffraction experiments by the Debye-Scherrer camera at the beamline BL-8B at Photon Factory in KEK. For x ≤ 0.1, the successive structural transitions similar to that observed in FeV2O4occur although the transition temperature of cubic-to-tetraLT transition rapidly decreases with increasing x. For 0.2≤ x ≤ 0.6, the only structural transition from cubic to tetragonal (c < a) was observed, however, the transition temperatures were somewhat different from the ferrimagnetic transition ones. On the other hand, for x ≥ 0.7, the crystal structure remains cubic down to 10 K similar to that of CoV2O4. These structural properties are discussed in terms of the orbital states of Fe2+ions obtained by the normal mode analysis, and they are compared with the results of the specific heat and magnetization measurements.

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20

Li, Xingguo. "Magnetic field-induced magnetic transition in Gd2Al compound." Journal of Magnetism and Magnetic Materials 205, no. 2-3 (November 1999): 307–10. http://dx.doi.org/10.1016/s0304-8853(99)00470-9.

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21

Feng, Tianhua, Ying Zhou, Dahe Liu, and Jensen Li. "Controlling magnetic dipole transition with magnetic plasmonic structures." Optics Letters 36, no. 12 (June 15, 2011): 2369. http://dx.doi.org/10.1364/ol.36.002369.

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22

Муртазаев, А. К., М. К. Бадиев, М. К. Рамазанов, and М. А. Магомедов. "Влияние магнитного поля на фазовые переходы в модели Гейзенберга на треугольной решетке." Физика твердого тела 63, no. 8 (2021): 1141. http://dx.doi.org/10.21883/ftt.2021.08.51168.068.

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The Monte Carlo method was used to study phase transitions, magnetic and thermodynamic properties of the three-dimensional antiferromagnetic Heisenberg model on a layered triangular lattice in a magnetic field. The studies were carried out in the range of variation of the magnetic field value 0≤h≤12. The magnetic structures of the ground state are obtained in a wide range of magnetic field values. The character of phase transitions is determined on the basis of the histogram method of data analysis. It was found that in the range 0≤h≤10, a first-order phase transition is realized. It is shown that a further increase in the magnetic field value removes the degeneracy of the ground state and smears out the phase transition.

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23

Jing, Chao, X. L. Wang, D. H. Yu, Y. J. Yang, B. J. Kang, S. X. Cao, J. C. Zhang, Z. Li, J. Zhu, and B. Lu. "Magnetic Phase Transitions and Magnetocaloric Properties of Gd₅Si_0.4In_3.6 Compound." Applied Mechanics and Materials 320 (May 2013): 67–71. http://dx.doi.org/10.4028/www.scientific.net/amm.320.67.

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The magnetic phase transitions and magnetocaloric properties of Gd5Si0.4In3.6 compound have been investigated. Magnetothermal measurements performed at different conditions reveal that the sample undergoes two magnetic phase transitions. One is a second-order transition from paramagnetic to ferromagnetic state at about 197 K, the other is a first-order transition when the temperature is reduced to 75 K. The magnetocaloric effect around Curie temperature (TC) was calculated in terms of isothermal magnetic entropy change by using Maxwells equation,which remains over a quite wide temperature span of 70 K between the temperature region from160 to 240 K, and thus makes this material attractive for magnetic refrigerator applications.

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24

Matsuda, Yasuhiro H. "Magnetic Field-Induced Phase Transition." Crystals 10, no. 10 (September 25, 2020): 866. http://dx.doi.org/10.3390/cryst10100866.

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25

Oyamada, A., P. Burlet, L. P. Regnault, A. Bouvet, R. Calemczuk, J. Rossat-Mignod, T. Suzuki, and T. Kasuya. "Magnetic phase transition in YbAs." Journal of Magnetism and Magnetic Materials 90-91 (December 1990): 441–42. http://dx.doi.org/10.1016/s0304-8853(10)80158-1.

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26

Stajic, J. "Describing an exotic magnetic transition." Science 352, no. 6282 (April 7, 2016): 183–85. http://dx.doi.org/10.1126/science.352.6282.183-n.

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27

Hashimoto, Yuzo, Toru Shigeoka, Nobuo Iwata, Hideki Yoshizawa, Yasuaki Ohara, Masakazu Nishi, Akifumi Murata, Masayoshi Ohashi, Hideya Onodera, and Yasuo Yamaguchi. "Magnetic Phase Transition in DyNi2Si2." Japanese Journal of Applied Physics 32, S3 (January 1, 1993): 338. http://dx.doi.org/10.7567/jjaps.32s3.338.

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28

Kramer, R. B. G., V. S. Egorov, A. Gordon, N. Logoboy, W. Joss, and V. A. Gasparov. "“Magnetic” phase transition in silver." Physica B: Condensed Matter 362, no. 1-4 (May 2005): 50–55. http://dx.doi.org/10.1016/j.physb.2005.01.474.

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29

Radić, Danko, Anatoly M. Kadigrobov, and Aleksa Bjeliš. "Magnetic breakdown induced Peierls transition." Physica B: Condensed Matter 404, no. 3-4 (March 2009): 364–66. http://dx.doi.org/10.1016/j.physb.2008.11.031.

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30

Vasil’ová, Mariana, Marián Reiffers, Andrzej Kowalczyk, Michał Falkowski, Tomasz Toliński, Milan Timko, Josef Šebek, and Eva Šantavá. "Magnetic phase transition in YbNi4Si." Physica B: Condensed Matter 403, no. 5-9 (April 2008): 778–79. http://dx.doi.org/10.1016/j.physb.2007.10.230.

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31

OKABE, H. "Magnetic phase transition in PdxCoyO2." Physica B: Condensed Matter 329-333 (May 2003): 948–49. http://dx.doi.org/10.1016/s0921-4526(02)02617-0.

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32

Adachi, Yoshiya, Motoyoshi Yuzuri, Takejiro Kaneko, Shunya Abe, and Hajime Yoshida. "Magnetic Phase Transition of Cr2Se3." Journal of the Physical Society of Japan 63, no. 1 (January 15, 1994): 369–70. http://dx.doi.org/10.1143/jpsj.63.369.

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33

Oohara, Yasuaki, Setsuo Mitsuda, Hideki Yoshizawa, Nariyasu Yaguchi, Hideaki Kuriyama, Takayuki Asano, and Mamoru Mekata. "Magnetic Phase Transition in AgCrO2." Journal of the Physical Society of Japan 63, no. 3 (March 15, 1994): 847–50. http://dx.doi.org/10.1143/jpsj.63.847.

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34

Akazawa, Teruhiko, Takashi Suzuki, Fumihiko Nakamura, Toshizo Fujita, Toshiro Takabatake, and Hironobu Fujii. "Anomalous Magnetic Transition in UNiSn." Journal of the Physical Society of Japan 65, no. 11 (November 15, 1996): 3661–65. http://dx.doi.org/10.1143/jpsj.65.3661.

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35

Gotaas, J. A., J. J. Rhyne, L. E. Wenger, and J. A. Mydosh. "Magnetic phase transition in Y0.97Dy0.03." Journal of Applied Physics 63, no. 8 (April 15, 1988): 3577–79. http://dx.doi.org/10.1063/1.340700.

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36

Wang, J. L., S. J. Campbell, O. Tegus, E. Brück, and S. X. Dou. "Magnetic phase transition in MnFeP0.5As0.4Si0.1." Journal of Physics: Conference Series 217 (March 1, 2010): 012132. http://dx.doi.org/10.1088/1742-6596/217/1/012132.

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37

Nwodo, Adline N., Ryota Kobayashi, Taoto Wakamori, Yoshihiro Matsumoto, Yoshifuru Mitsui, Rie Y. Umetsu, Masahiko Hiroi, Kohki Takahashi, Yoshiya Uwatoko, and Keiichi Koyama. "Magnetic Phase Transition of Mn1.9Fe0.1Sb0.9Sn0.1." IEEE Magnetics Letters 9 (2018): 1–4. http://dx.doi.org/10.1109/lmag.2017.2768023.

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38

Kettle, S. F. A. "Transition Metal Nuclear Magnetic Resonance." Spectrochimica Acta Part A: Molecular Spectroscopy 49, no. 7 (July 1993): 1039. http://dx.doi.org/10.1016/0584-8539(93)80232-y.

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39

Buchachenko, Anatolii L., Valery F. Tarasov, Naresh D. Ghatlia, and Nicholas J. Turro. "Magnetic probing of transition states." Chemical Physics Letters 192, no. 2-3 (May 1992): 139–44. http://dx.doi.org/10.1016/0009-2614(92)85443-e.

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40

Z̊ołnierek, Z., T. Plackowski, D. Włosewicz, K. Rogacki, A. J. Zaleski, and J. Janczak. "Magnetic phase transition in UAu1.1Ga2.5." Physica B: Condensed Matter 192, no. 4 (December 1993): 351–57. http://dx.doi.org/10.1016/0921-4526(93)90010-4.

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41

Ikeda, H., M. Hidaka, and B. M. Wanklyn. "Magnetic phase transition in CsVF4." Physica B: Condensed Matter 160, no. 3 (December 1989): 287–92. http://dx.doi.org/10.1016/0921-4526(90)90330-w.

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42

Chattopadhyay, Tapan, and H. Fjellvåg. "Magnetic phase transition in MnTe2." Physics Letters A 120, no. 1 (January 1987): 44–46. http://dx.doi.org/10.1016/0375-9601(87)90261-1.

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43

Загребин, М. А., М. В. Матюнина, А. Б. Кошкин, В. Д. Бучельников, and В. В. Соколовский. "Фазовые превращения в сплавах Fe-=SUB=-100-x-=/SUB=-Si-=SUB=-x-=/SUB=-: исследования ab initio." Физика твердого тела 62, no. 5 (2020): 655. http://dx.doi.org/10.21883/ftt.2020.05.49224.24m.

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In present work, on the basis of structural and magnetic phase transition temperatures estimated theoretically from the first principles, the concentration phase diagram for Fe100-xSix (9.375 ≤ x ≤ 25.0 at.%) was plotted. Structural phase transition temperatures for the experimentally observed crystal structures were obtained from the structural optimization. The Curie temperatures were estimated from mean field approximation using ab initio calculated exchange coupling constants. Both structural and magnetic phase transitions temperatures are found in qualitative agreement with the experiment. For the whole considered concentration range, structural transitions from the ordered cubic to fully disordered through partially disordered one are appeared with temperature increasing. As for magnetic transformations, ferromagnetic-paramagnetic transition is observed for all compositions, however, it happens in different crystal phases.

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44

BASITH, M. A., M. SHAHPARAN, M. HUQ, S. K. MANJURA HOQUE, and M. A. HAKIM. "OBSERVATION OF HIGH Tc IN THE BILAYERED La2SmxSr1-xMn2O7 PEROVSKITE." Modern Physics Letters B 21, no. 23 (October 10, 2007): 1569–77. http://dx.doi.org/10.1142/s0217984907013973.

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Bulk layered perovskite samples La 2 Sm x Sr 1-x Mn 2 O 7 (x = 0.4, 0.6 and 0.8) were prepared by the conventional solid-state reaction technique and their temperature dependence of electrical resistance and magnetization measurements were performed. The metal-insulator (M-I) transition, magnetic phase transition and the colossal magnetoresisitance phenomena were observed. The M-I transition peak temperature (T p ) shifts towards lower temperature with increasing x while magnetic field shifts T p to the high temperature regime. Experimental results show that layered manganites La 2 Sm x Sr 1-x Mn 2 O 7 (x = 0.4, 0.6 and 0.8) exhibit ferromagnetic-to-paramagnetic transitions at Curie temperature T c ~ 355, 286 and 277 K for x = 0.4, 0.6 and 0.8, respectively. A large deviation between the metal-insulator transition and the magnetic transition temperature is observed for all the doping concentrations. But in the case of well-known ABO 3 type perovskite manganites like La 0.75 Ca 0.25 MnO 3, the M-I transition was found previously very close to magnetic transition. At 78 K, a sharp increase of magnetoresistance was observed at low magnetic fields.

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Doerner, Mary F., and Richard L. White. "Materials Issues in Magnetic-Disk Performance." MRS Bulletin 21, no. 9 (September 1996): 28–34. http://dx.doi.org/10.1557/s0883769400036332.

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The continued exponential growth in areal density for longitudinal magnetic-recording devices places ever more stringent demands on disk performance. The design of materials and processes must provide the required advances in technology. The magnetic properties are controlled through the choice of underlayers, magnetic alloys, and the deposition processes that control crystallographic orientation and magnetic isolation between grains. The requirement of lower head-disk spacing places increasing stress on the tribological performance of the disks, controlled by a very thin overcoat and lubricant layer. This article reviews the various materials issues relevant to magnetic-disk technology.The major obstacle for achieving high areal density in thin-film media is transition noise. This noise arises from the zig-zag transition boundaries that occur due to cooperative switching of the magnetic grains. Both exchange coupling between grains and magnetostatic interactions cause magnetic-cluster sizes larger than the grain size. The goal is to magnetically isolate the grains and keep the grain size small. As the dimensions of the bit cell shrink, smaller grain size is required to obtain enough grains per bit cell to maintain the required signal-to-noise ratio (SNR). In the 10–40-Gbits/in.2 areal-density range, the issue of thermal stability of small (<10 nm), isolated grains needs to be addressed.In addition to good SNR, a narrow transition width is needed in order to pack the transitions closer together. The objective is to minimize interactions between transitions to reduce nonlinear amplitude loss and superlinear noise.

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Lachman, Ella O., Andrea F. Young, Anthony Richardella, Jo Cuppens, H. R. Naren, Yonathan Anahory, Alexander Y. Meltzer, et al. "Visualization of superparamagnetic dynamics in magnetic topological insulators." Science Advances 1, no. 10 (November 2015): e1500740. http://dx.doi.org/10.1126/sciadv.1500740.

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Quantized Hall conductance is a generic feature of two-dimensional electronic systems with broken time reversal symmetry. In the quantum anomalous Hall state recently discovered in magnetic topological insulators, time reversal symmetry is believed to be broken by long-range ferromagnetic order, with quantized resistance observed even at zero external magnetic field. We use scanning nanoSQUID (nano–superconducting quantum interference device) magnetic imaging to provide a direct visualization of the dynamics of the quantum phase transition between the two anomalous Hall plateaus in a Cr-doped (Bi,Sb)2Te3 thin film. Contrary to naive expectations based on macroscopic magnetometry, our measurements reveal a superparamagnetic state formed by weakly interacting magnetic domains with a characteristic size of a few tens of nanometers. The magnetic phase transition occurs through random reversals of these local moments, which drive the electronic Hall plateau transition. Surprisingly, we find that the electronic system can, in turn, drive the dynamics of the magnetic system, revealing a subtle interplay between the two coupled quantum phase transitions.

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Guo, Zhen Gang, and Hong Mei Qiu. "Magnetocaloric Effect of Ni₄₄Co₆Mn₄₀Cu_xSn_10-x Quinary Alloy Comes from the Martensitic Transformation." Key Engineering Materials 787 (November 2018): 17–24. http://dx.doi.org/10.4028/www.scientific.net/kem.787.17.

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The structure, martensitic transition and magnetic properties of Ni44Co6Mn40CuxSn10-x quinary alloy are investigated systematically. The substitution of Cu for Sn is found to reduce the symmetry of crystal structure, showing an evolution from cubic to tetragonal phase at room temperature. Two magnetic transitions were observed in the alloys, martensitic transition and Curie transition. The critical temperatures of martensitic transformation are found to increase nearly linearly with increasing valence electron concentration caused by Cu substitution for Sn, while Curie temperature of the austenitic phase decreases with the increasing Cu content in the alloys. The Ni44Co6Mn40CuxSn10-x alloys have a large magnetic entropy change across the martensitic transition, reaching 26.8 Jkg-1K-1 under a field change of 3T, because of the strong coupling between structure and magnetism, which shows a great applicable prosperity in magnetic refrigeration technology.

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Yamada, Atsushi. "A study of the magnetic properties in the Hubbard model on the honeycomb lattice by variational cluster approximation." International Journal of Modern Physics B 30, no. 23 (September 15, 2016): 1650158. http://dx.doi.org/10.1142/s0217979216501587.

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Magnetic properties of the half-filled Hubbard model on the honeycomb lattice, which is a simple model of graphene, are studied using the variational cluster approximation (VCA). We found that the critical interaction strength of a magnetic transition is slightly lower than that of the nonmagnetic metal-to-insulator transition and the magnetic order parameter is already nonnegligible at the latter transition point. Thus, a semi-metallic state becomes a magnetic insulator as the interaction strength increases, and a spin liquid state characterized by a Mott insulator without spontaneously broken spatial or spin symmetry, or a state very close to that is not realized in this system. Both the magnetic and nonmagnetic metal-to-insulator transitions are of the second-order. Our results agree with recent large scale quantum Monte Carlo (QMC) simulations.

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Galdina, A. N. "Supercritical behavior of magnetic and liquid model systems." Journal of Physics and Electronics 27, no. 2 (June 23, 2020): 37–42. http://dx.doi.org/10.15421/331920.

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The supercritical transitions are widely occurring. They include the supercritical transitions in the liquid-vapor system, ferromagnetic transitions, transitions in polymers, many transitions in liquid crystals, and some structural transitions. In the paper it is emphasized that the nature of the critical and supercritical transitions is the same – these are continuous fluctuation transitions. Above the critical temperature the system passes through a region of lowered stability, which leads to increase of fluctuations of energy and external parameters of the system. From the point of view of thermodynamic stability this indicates the existence of a continuous supercritical transition between supercritical mesophases. Knowing the basic stability characteristics of a system, we derive the equation of these mesophase transitions. Depending on a thermal equation type, we can get one or several such equations, which may not coincide. This approves the fact that a supercritical transition occurs in a certain interval of thermodynamic forces. In the paper the relations between the critical exponents of thermodynamic parameters of the system are obtained and the conditions of continuous conjugation of the lowered stability line to subcritical coexistence line are investigated. The results are applied to the Curie–Weiss and van der Waals models: we obtain the quasi-spinodal equation for these systems and analyze the critical and supercritical behavior of the stability characteristics.

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Heckotter, J., J. Thewes, D. Frohlich, M. Abmann, and M. Bayer. "Landau-level quantization of the yellow excitons in cuprous oxide." Физика твердого тела 60, no. 8 (2018): 1585. http://dx.doi.org/10.21883/ftt.2018.08.46252.20gr.

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AbstractLately, the yellow series of P -excitons in cuprous oxide could be resolved up to the principal quantum number n = 25. Adding a magnetic field, leads to additional confinement normal to the field. Thereby, the transition associated with the exciton n is transformed into the transition between the electron and hole Landau levels with quantum number n , once the associated magnetic length becomes smaller than the related exciton Bohr radius. The magnetic field of this transition scales roughly as n ^–3. As a consequence of the extended exciton series, we are able to observe Landau level transitions with unprecedented high quantum numbers of more than 75.

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